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Connection management in HTTP/1.x

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Revision 1120479:

Revision 1120479 by bunnybooboo on September 18, 2016 at 6:39:01 AM PDT

Revision 1120485:

Revision 1120485 by bunnybooboo on September 18, 2016 at 6:52:20 AM PDT

Title:

Connection management in HTTP/1.x

Slug:

Web/HTTP/Connection_management_in_HTTP_1.x

Tags:

"Guide" "HTTP" "Performance" "WebMechanics" "Performance"

Comment:

editorial review of summary

editorial review of short-lived

Content:

	Revision 1120479			Revision 1120485
n	37	The original model of HTTP, and the default one in HTTP/1.0	n	37	The original model of HTTP, and the default one in HTTP/1.0
	>	, is <em>short-lived connections</em>. Each HTTP request is perfo		>	, is <em>short-lived connections</em>. Each HTTP request is compl
	>	rmed on its own connection; that means that there is a TCP handsh		>	eted on its own connection; this means a TCP handshake happens be
	>	ake happening before each HTTP request, and these are serialized.		>	fore each HTTP request, and these are serialized.
n	40	The TCP handshake itself is time-consuming, but a TCP conne	n	40	The TCP handshake itself is time-consuming, but a TCP conne
	>	ction adapts itself to its load and becomes more efficient with l		>	ction adapts to its load, becoming more efficient with more susta
	>	onger-lived connections. This model doesn't make use of this feat		>	ined (or warm) connections. Short-lived connections do not make u
	>	ure of TCP and performance is degraded from the optimum by always		>	se of this efficiency feature of TCP, and performance degrades fr
	>	transmitting over cold connections, rather than over warm ones.		>	om optimum by persisting to transmit over a new, cold connection.
n	43	This model is the default model used with HTTP/1.0 (that is	n	43	This model is the default model used in HTTP/1.0 (if there
	>	it is the one used if there is no {{HTTPHeader("Connection")}} h		>	is no {{HTTPHeader("Connection")}} header, or if its value is set
	>	eader, or if its value is set to <code>close</code>. With HTTP/1.		>	to <code>close</code>). In HTTP/1.1, this model is only used whe
	>	1, this model is only used if the {{HTTPHeader("Connection")}} he		>	n the {{HTTPHeader("Connection")}} header is sent with a value of
	>	ader is sent with a value of <code>close</code>.		>	<code>close</code>.
t	47	Unless dealing with a very old system that doesn't suppor	t	47	Unless dealing with a very old system, which doesn't supp
	>	t persistent connection, there is no compelling reason to use thi		>	ort a persistent connection, there is no compelling reason to use
	>	s model.		>	this model.

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